Allen key 6×30 aisi 316 – code: a4-7991-06×030 – Osculati

Hex socket screws 6×30 in AISI 316 stainless steel Osculati (DIN 7991 / UNI 5933)

The hex socket screws 6×30 in AISI 316 stainless steel Osculati are a fastening solution designed for technical assemblies where it is important to achieve a flush surface coupling thanks to the countersunk head and practical tightening via hex socket. The product is identified by supplier code a4-7991-06×030 and it belongs to the family DIN 7991 / UNI 5933, typical of countersunk head screws with internal hex socket.

In nautical and onboard plant engineering, this type of screw is often chosen when a neat fastening is desired, with the head fitting into the countersink of the component, reducing protrusions and interference points. The choice of the’AISI 316 makes it suitable for contexts where a stainless steel material commonly used in marine and maintenance applications is sought.

Features and construction details

Type: countersunk head with hex socket

These Allen screws belong to the category of countersunk head screws with hex socket. The countersunk head is designed to work with countersunk seats, allowing for an assembly with a flush or slightly recessed head (depending on the workpiece processing and the correct matching of the countersink).

• Countersunk head: indicated when you want to limit protrusions and achieve a cleaner finish.
• Hex socket (Allen): allows tightening with a hex key, useful in spaces where lateral access is limited.

Material: stainless steel AISI 316

The declared material is AISI 316 stainless steel, frequently used in nautical and plant engineering fields for the production of small parts and fastening components. When choosing, it is good practice to consider the environment of use and the pairing with other materials present in the assembly.

Reference standard: DIN 7991 / UNI 5933

The reference to DIN 7991 and UNI 5933 helps to frame the screw geometry (countersunk head with hex socket) and simplify replacement during maintenance when replicating an existing fastening. In real applications, dimensional compliance also depends on the tolerances of the receiving component and the correct execution of the countersink.

Product identification

• Supplier: Osculati S.r.l.
• Supplier product code: a4-7991-06×030
• Format: 6×30

To avoid errors during ordering or restocking, it is recommended to refer to the code a4-7991-06×030, especially when managing spare parts lists or scheduled maintenance.

Typical applications (nautical and plant engineering)

Countersunk head screws with hex socket are used in many situations where a reliable fastening with reduced surface bulk is needed. In nautical and plant engineering fields, they can be used in assemblies where the presence of a protruding head could create interference, snag points, or difficulties in coupling with other components.

Examples of use

• Light carpentry and accessories: fastenings on plates, brackets, and components with countersunk seats.
• Fittings and finishes: when a flush head is desired for a neater result.
• Maintenance and replacement: replacement of existing screws belonging to the DIN 7991 / UNI 5933 family.
• Technical assemblies: where the internal hex socket facilitates tightening in confined spaces.

The correct application always depends on the compatibility of the countersink, the thickness of the materials, and the design of the assembly. If the component is not prepared with an adequate countersunk seat, the head may not be flush or may not rest properly.

Usage and selection notes

Verification of the countersink and measurements

For a correct choice, always check:

• Compatibility of the countersink of the component with the countersunk head of the screw.
• Measurements required by the assembly (size 6×30) and available space for insertion.
• Accessibility for the hex key during tightening.

Good maintenance practices

In maintenance operations, especially on onboard systems and components, it is useful to maintain traceability and uniformity of spare parts. The reference to DIN 7991 / UNI 5933 and to Osculati code a4-7991-06×030 facilitates product identification and reduces the risk of non-equivalent replacements.

Important note

The information provided describes the product type (countersunk head, hex socket, AISI 316 material, and indicated normative family). For specific applications, always verify compatibility with the component to be assembled and the intended usage conditions.

FAQ – Frequently Asked Questions

What type of head do these Osculati Allen screws have?

They are hex socket screws with countersunk head and hex socket, designed to work with a countersunk seat and achieve a flush surface fastening.

What is the material of the screws?

The indicated material is AISI 316 stainless steel.

Which standards do they refer to?

The product is associated with the DIN 7991 / UNI 5933 family, relating to countersunk head screws with internal hex socket.

What is the supplier's product code?

The supplier product code is a4-7991-06×030 (Osculati S.r.l.).

What should I check before purchase or assembly?

It is advisable to check the compatibility of the countersink and dimensions with the component to be assembled, as well as the accessibility for the hex key during tightening.